tube

As a noun rod

is road, roadstead.

As a verb tube is

.

Drain is a synonym of tube.

As verbs the difference between drain and tube

is that drain is to lose liquid while tube is .

As a noun drain

is a conduit allowing liquid to flow out of an otherwise contained volume.

As nouns the difference between tube and column

is that tube is anything that is hollow and cylindrical in shape while column is a solid upright structure designed usually to support a larger structure above it, such as a roof or horizontal beam, but sometimes for decoration.

As a verb tube

is to make or use tubes.

As a proper noun Tube

is the London Underground.

Tube is a related term of channel.

As a verb tube

is .

As a proper noun channel is

(by ellipsis) the english channel.

As a verb tube is

.

Tube is a related term of watercourse.

As a verb tube

is .

As a noun watercourse is

any channel, either natural or artificial, through which water flows.

Tube is a related term of conductor.

As a verb tube

is .

As a noun conductor is

one who conducts or leads; a guide; a director.

As verbs the difference between tube and bulb

is that tube is while bulb is to take the shape of a bulb; to swell.

As a noun bulb is

any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end.